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It looks like the decision rests on the adjudicators view of when day 1 starts?
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When day 1 starts is absolute and well defined.
Which is more then can be said about Reading's PCNs.
It's whether an adjudicator will agree that the PCN timing is wrong and prejudicial to the unwary recipient.
If CP takes on the appeal hearing, should it get that far, at least the adjudicator will listen and take it seriously